-------------------------------------------------------------------------------
-- alu_ent.vhd
-------------------------------------------------------------------------------
--
-- This file is part of SKUMLI.
-- Copyright (C) 2011 Davide Giuseppe Monaco (black.ralkass@gmail.com)
--
-- SKUMLI is free software: you can redistribute it and/or modify
-- it under the terms of the GNU General Public License as published by
-- the Free Software Foundation, either version 3 of the License, or
-- (at your option) any later version.
--
-- SKUMLI is distributed in the hope that it will be useful,
-- but WITHOUT ANY WARRANTY; without even the implied warranty of
-- MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
-- GNU General Public License for more details.
--
-- You should have received a copy of the GNU General Public License
-- along with SKUMLI.  If not, see <http://www.gnu.org/licenses/>.
--
-------------------------------------------------------------------------------
library ieee;
use ieee.std_logic_1164.all;
-------------------------------------------------------------------------------
entity alu is

  generic ( N : integer := 32 );

  port (
    a    : in  std_logic_vector(N - 1 downto 0);    -- operand A
    b    : in  std_logic_vector(N - 1 downto 0);    -- operand B

    op   : in  std_logic_vector(1 downto 0);        -- operation

    zero : out std_logic;                           -- high if A - B is zero
    dout : out std_logic_vector(N - 1 downto 0)     -- alu output
  );

end alu;
